It's a little known fact, but the BFG (insipiration for popular weapon in the Doom series games) was actually developed at the Institute for the Development of Special-Purpose Weaponry in the USSR in 1941. The Red Army fielded entire divisions armed with nothing but the BFG, but it was not used on the German Front. These weapons were only used against the Nazi zombies on the Martian Front, which is a little known historical chapter which came to an end with the battle of Mount Olympus in summer 1943, ensuring that Martian zombies would never again have to endure the oppression of Nazi domination.